package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.search.pojo.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;


@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;


    @Override
    public Map search(Map<String, String> searchMap) {

        Map<String,Object> resultMap = new HashMap<>();

        //构建查询

        if(searchMap != null){

            //构建查询条件封装对象
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();

            //布尔，用于组合条件查询
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

            //关键字查询
            if(StringUtils.isNotEmpty(searchMap.get("keywords"))){
                boolQuery.must(QueryBuilders.matchQuery("name",searchMap.get("keywords")).operator(Operator.AND));
            }

            //品牌查询
            if(StringUtils.isNotEmpty(searchMap.get("brand"))){
                boolQuery.filter(QueryBuilders.termQuery("brandName",searchMap.get("brand")));
            }

            //按规格进行过滤查询
            for (String key : searchMap.keySet()) {
                //判断是否是规格条件
                if(key.startsWith("spec_")){
                    String value = searchMap.get(key).replace("%2B", "+");
                    boolQuery.filter(QueryBuilders.termQuery("specMap." + key.substring(5) + ".keyword",value));
                }
            }

            //根据价格区间查询
            if (StringUtils.isNotEmpty(searchMap.get("price"))){
                //根据“-”分隔
                String[] prices = searchMap.get("price").split("-");

                //长度为2，小于上限
                if (prices.length == 2){
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }



            nativeSearchQueryBuilder.withQuery(boolQuery);

            //根据品牌进行聚合查询
            String skuBrand = "skuBrand";
            //添加聚合条件
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //根据规格进行聚合查询
            String skuSpec = "skuSpec";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //分页查询
            String pageNum = searchMap.get("pageNum");
            String pageSize = searchMap.get("pageSize");

            if (StringUtils.isEmpty(pageNum)){
                pageNum = "1";
            }

            if (StringUtils.isEmpty(pageSize)){
                pageSize = "30";
            }

            //设置分页
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum) -1,Integer.parseInt(pageSize)));


            //排序
            if (StringUtils.isNotEmpty(searchMap.get("sortField")) && StringUtils.isNotEmpty(searchMap.get("sortRule"))){
                if ("ASC".equals(searchMap.get("sortRule"))){
                    //升序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.ASC));
                }else {
                    //降序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.DESC));
                }
            }

            //设置高亮域以及高亮的样式
            HighlightBuilder.Field field = new HighlightBuilder.Field("name")//高亮域
                    .preTags("<span style='color:red'>")//前缀
                    .postTags("</span>");//后缀

            nativeSearchQueryBuilder.withHighlightFields(field);

            // 三个参数：
            //1.条件构建对象
            //2.查询操作实体类
            //3.查询结果操作对象
            AggregatedPage<SkuInfo> resultInfo = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
                    //封装查询到的数据
                    List<T> list = new ArrayList<>();

                    //查到的数据结果（命中）
                    SearchHits hits = searchResponse.getHits();

                    if (hits != null){
                        //查询到数据

                        for (SearchHit hit : hits) {

                            //转换数据类型，将searchhit类型转换成skuinfo
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (highlightFields != null && highlightFields.size() > 0){
                                //替换数据
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }
                            list.add((T) skuInfo);
                        }
                    }

                    return new AggregatedPageImpl<T>(list,pageable,hits.getTotalHits(),searchResponse.getAggregations());
                }
            });
            //封装查询结果,注意AggregatedPage作用域只在if里面
            //总记录数
            resultMap.put("total",resultInfo.getTotalElements());
            //总页数
            resultMap.put("totalPages",resultInfo.getTotalPages());
            //数据
            resultMap.put("rows",resultInfo.getContent());

            //封装品牌分组结果
            StringTerms brandTerms = (StringTerms) resultInfo.getAggregation(skuBrand);
            //流运算
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList",brandList);
            //封装规格分组结果
            StringTerms specTerms = (StringTerms) resultInfo.getAggregation(skuSpec);
            List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList",this.formartSpec(specList));

            //当前页
            resultMap.put("pageNum",pageNum);

        }

        return resultMap;


    }

    public Map<String,Set<String>> formartSpec(List<String> specList){
        Map<String,Set<String>> resultMap = new HashMap<>();

        if(specList != null && specList.size() > 0){
            //规格列表有值
            for (String specJsonString : specList) {
                Map<String,String> map = JSON.parseObject(specJsonString, Map.class);
                for (String specKey : map.keySet()) {
                    Set<String> specSet = resultMap.get(specKey);
                    if (specSet == null){
                        //没有就先new出来
                        specSet = new HashSet<>();
                    }
                    //将规格信息set中
                    specSet.add(map.get(specKey));
                    resultMap.put(specKey,specSet);


                }
            }

        }
        return resultMap;
    }
}
